The psi for line 4 is 9100 . The difference between 9200 high and low 8200 = 1000 . (EV or ES ) Shotshells are a pretty sloppy system and those are good numbers ( while not the best I have ever gotten ) for a shotshell . I am very happy with the consistency of the load. Even an ev of 1700 would be acceptable , I have seen tested Factory loads that where not that good
For me max average would be 11000 psi , for my Ithaca NID . I was hoping for something above 9000 psi and around 1200 -1250 fps .
From my experience with Unique in the past an increase of 1 grain should give an increase in pressure of about 500-800 psi ave, and put where I want to be speed wise . the only real way to tell is have it retested .
Disclaimer : Everyone should always stick to tested data and should never increase ( or change ) any load without having it retested .
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